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Allowance for Probable Loan Losses (Details 6) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Loan portfolio by credit quality indicator    
Portfolio, total $ 5,199,235 $ 4,775,004
Pass
    
Loan portfolio by credit quality indicator    
Portfolio, total 4,942,387 4,369,031
Special Review
    
Loan portfolio by credit quality indicator    
Portfolio, total 73,077 169,097
Watch List - Pass
    
Loan portfolio by credit quality indicator    
Portfolio, total 35,619 65,855
Watch List - Substandard
    
Loan portfolio by credit quality indicator    
Portfolio, total 72,259 88,016
Watch List - Impaired
    
Loan portfolio by credit quality indicator    
Portfolio, total 75,893 83,005
Commercial
    
Loan portfolio by credit quality indicator    
Portfolio, total 1,042,642 769,110
Commercial | Pass
    
Loan portfolio by credit quality indicator    
Portfolio, total 955,522 675,263
Commercial | Special Review
    
Loan portfolio by credit quality indicator    
Portfolio, total 2,270 4,278
Commercial | Watch List - Pass
    
Loan portfolio by credit quality indicator    
Portfolio, total 4,389 16,535
Commercial | Watch List - Substandard
    
Loan portfolio by credit quality indicator    
Portfolio, total 46,278 40,266
Commercial | Watch List - Impaired
    
Loan portfolio by credit quality indicator    
Portfolio, total 34,183 32,768
Commercial real estate: other construction and land development
    
Loan portfolio by credit quality indicator    
Portfolio, total 1,208,508 1,147,669
Commercial real estate: other construction and land development | Pass
    
Loan portfolio by credit quality indicator    
Portfolio, total 1,167,295 1,038,749
Commercial real estate: other construction and land development | Special Review
    
Loan portfolio by credit quality indicator    
Portfolio, total 14,247 55,079
Commercial real estate: other construction and land development | Watch List - Pass
    
Loan portfolio by credit quality indicator    
Portfolio, total 9,318 2,614
Commercial real estate: other construction and land development | Watch List - Substandard
    
Loan portfolio by credit quality indicator    
Portfolio, total 3,672 22,567
Commercial real estate: other construction and land development | Watch List - Impaired
    
Loan portfolio by credit quality indicator    
Portfolio, total 13,976 28,660
Commercial real estate: farmland and commercial
    
Loan portfolio by credit quality indicator    
Portfolio, total 1,750,039 1,673,322
Commercial real estate: farmland and commercial | Pass
    
Loan portfolio by credit quality indicator    
Portfolio, total 1,635,179 1,486,572
Commercial real estate: farmland and commercial | Special Review
    
Loan portfolio by credit quality indicator    
Portfolio, total 56,438 109,144
Commercial real estate: farmland and commercial | Watch List - Pass
    
Loan portfolio by credit quality indicator    
Portfolio, total 21,912 46,316
Commercial real estate: farmland and commercial | Watch List - Substandard
    
Loan portfolio by credit quality indicator    
Portfolio, total 20,472 17,345
Commercial real estate: farmland and commercial | Watch List - Impaired
    
Loan portfolio by credit quality indicator    
Portfolio, total 16,038 13,945
Commercial real estate: multifamily
    
Loan portfolio by credit quality indicator    
Portfolio, total 102,098 82,948
Commercial real estate: multifamily | Pass
    
Loan portfolio by credit quality indicator    
Portfolio, total 100,948 82,542
Commercial real estate: multifamily | Watch List - Pass
    
Loan portfolio by credit quality indicator    
Portfolio, total   53
Commercial real estate: multifamily | Watch List - Substandard
    
Loan portfolio by credit quality indicator    
Portfolio, total 855  
Commercial real estate: multifamily | Watch List - Impaired
    
Loan portfolio by credit quality indicator    
Portfolio, total 295 353
Residential: first lien
    
Loan portfolio by credit quality indicator    
Portfolio, total 438,462 456,731
Residential: first lien | Pass
    
Loan portfolio by credit quality indicator    
Portfolio, total 432,067 446,218
Residential: first lien | Special Review
    
Loan portfolio by credit quality indicator    
Portfolio, total 122 519
Residential: first lien | Watch List - Substandard
    
Loan portfolio by credit quality indicator    
Portfolio, total 120 6,338
Residential: first lien | Watch List - Impaired
    
Loan portfolio by credit quality indicator    
Portfolio, total 6,153 3,656
Residential: junior lien
    
Loan portfolio by credit quality indicator    
Portfolio, total 409,230 381,736
Residential: junior lien | Pass
    
Loan portfolio by credit quality indicator    
Portfolio, total 405,731 378,000
Residential: junior lien | Special Review
    
Loan portfolio by credit quality indicator    
Portfolio, total   77
Residential: junior lien | Watch List - Pass
    
Loan portfolio by credit quality indicator    
Portfolio, total   309
Residential: junior lien | Watch List - Substandard
    
Loan portfolio by credit quality indicator    
Portfolio, total 293 1,500
Residential: junior lien | Watch List - Impaired
    
Loan portfolio by credit quality indicator    
Portfolio, total 3,206 1,850
Consumer
    
Loan portfolio by credit quality indicator    
Portfolio, total 66,414 74,514
Consumer | Pass
    
Loan portfolio by credit quality indicator    
Portfolio, total 64,808 73,188
Consumer | Watch List - Impaired
    
Loan portfolio by credit quality indicator    
Portfolio, total 1,606 1,326
Foreign
    
Loan portfolio by credit quality indicator    
Portfolio, total 181,842 188,974
Foreign | Pass
    
Loan portfolio by credit quality indicator    
Portfolio, total 180,837 188,499
Foreign | Watch List - Pass
    
Loan portfolio by credit quality indicator    
Portfolio, total   28
Foreign | Watch List - Substandard
    
Loan portfolio by credit quality indicator    
Portfolio, total 569  
Foreign | Watch List - Impaired
    
Loan portfolio by credit quality indicator    
Portfolio, total $ 436 $ 447